JPH048889B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a snap switch having a snap system disposed within a casing, wherein the snap system has an operating arm and a snap arm that can be operated from the outside, and both arms each have an operating arm that can be operated from the outside. fixed at one end to the casing and connected at the other end via a joint in each case to a tilting spring arranged between the two arms;
A switching arm carrying a movable contact is arranged adjacent to the snap arm, which switching arm, during movement of the snap arm, is moved by one of two stops acting on the switching arm from opposite sides. It relates to things that are becoming more and more carried away.

In known snap switches of this type, the switching arm has movable contacts that cooperate with contacts fixed on the housing. The switching arm and the operating arm consist of a sheet metal strip which is fixed at its end to the housing. The snap arm is pivotally mounted on the switching arm near the clamping end. An embossment of the sheet metal is provided in the area of the contact to form the first stop. To form the second contact, the snap arm has a stepped bend near the tilting spring with which the free end of the switch arm cooperates.

Each end position of the snap system is given, on the one hand, by the contact of a movable contact on a contact fixed on the casing, and on the other hand, by the contact of the switch arm on an adjustable stop fixed on the casing. It is being

The advantages of this kind of snap switch are:
the force holding the switching arm in both end positions;
It is also possible that the contact pressure up to the moment of switching has a predetermined minimum value, that is, it does not fall to zero. In this case, the position of the two stoppers plays a major role in the mode of operation of the snap switch and the minimum value of the contact pressure. However, in known snap switches it is only possible with difficulty to maintain exact dimensions due to the embossments and stepped bends in the sheet metal. therefore,
Particularly in mass production, manufacturing errors occur that become noticeable.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve a snap switch of the type mentioned at the outset and to provide a snap switch in which manufacturing tolerances based on the position of the stop can be significantly reduced.

In order to solve this problem, in a first embodiment of the invention, a window is arranged in the end section of the tilting spring formed by a bent sheet metal strip on the side of the snap arm; , the free end of the switching arm protrudes, and the window edges located opposite one another form a stop.

Further, in the configuration of the second invention, a support plate pivotally connected to the snap arm is provided at the end of the coil spring acting as a tilting spring on the snap arm side, and a window is disposed in the support plate. , the free end of the switching arm projects into the window, and the window edges located opposite one another form a stop.

With the embodiment of the invention, the window can be punched out with great precision, so that the window edges have a precisely defined distance from each other. It is also extremely simple, inexpensive, and accurate to manufacture. In the embodiment of the invention, the stop is no longer provided on the snap arm, but the window can be precisely assigned to the snap arm due to the fact that the snap arm is connected to the tilting spring via a joint.
Even if the tilting spring is formed by a bent sheet metal strip, or if a supporting plate is provided for forming the joint, no additional components for the window are necessary.

In an advantageous embodiment of the invention, the window has an extension on both sides adjacent to the stopper, the height of which is lower than the height of the stopper, and on each side adjacent to the end of the snap arm. The arranged joint parts are engaged. With this arrangement, the window and joint cutouts can be formed in a single punching process, and in addition, the problem of errors associated with the placement of the windows and joints is eliminated.

In the embodiments described above, it is advantageous if the joint parts are connected to one another at their free ends. With this configuration, the rigidity of the joint portion can be increased, and as a result, a relatively narrow joint portion can be used.

In order to further simplify the construction of the snap switch according to the invention, a further embodiment of the invention provides that the snap arm is constructed in one piece with the switching arm and has two partial arms extending along both sides of the switching arm. have. This arrangement eliminates the problem of errors caused by different bearings of the snap arm and the switching arm.

Recognizing that the relative movement between the snap arm and the switching arm may be relatively small in order to obtain the above-mentioned uses, another embodiment of the invention provides that the snap arm and the switching arm are made of spring steel. a thin plate strip comprising a spring section which is common to both arms and which, when configured in this way, is capable of absorbing relatively large forces, i.e. large contact pressures. components that can be obtained under otherwise equal circumstances. This is because the stiffness is increased by the common spring section, and a certain stiffness is likewise caused by the short length of the switching arm and the snap arm in the non-common range.

Next, embodiments of the present invention will be described with reference to the drawings.

In the snap switch shown in FIGS. 1 to 3, a snap system is provided in a casing 1, and this snap system has an operating arm 2, which has a bent end. 3 to the casing 1 via rivets 4 or the like. The operating arm 2 is adapted to be loaded by an operating member 6 in the region 7 of the longitudinal stay 5 and has a joint 9 at its bent end 8.
is engaged through the slit 10 of the bent tilting spring 11.

In the other end region of the tilting spring 11, a window 12 is provided which has two laterally extending extensions 13, 14. The two joint parts 15, 16 of the snap arm 17, which are connected to each other via a web 38 at their free ends, engage in laterally extending window extensions 13, 14 and thereby Then, the tilting spring 11 and the snap arm 17
A joint is created between the two. window 1
Two stops A, B are formed in the central region of 2, between which the end 19 of the switching arm 18 can be moved back and forth. The switching arm 18 has movable contacts 20 that cooperate with contacts 21 fixed to the housing.

The snap arm 17 and the switching arm 18 are part of a common spring-elastic sheet metal strip 22, which at its bent end 23, as well as the end 3 of the operating arm 2, is fitted with a rivet 4 or the like. It is fixed to the casing 1 via something similar to.
A common spring section 24 is connected to the end 23, following which a slot-shaped cutout 25 begins, by which the snap arm 17 and the switching arm 18 are separated from each other. ing. Range 26 of common spring section 24
A regulating device 27 acts on this.

Manufacturing of each member of the snap system is extremely simple. This means that the spring sheet metal strip only needs to be punched out and bent. The window 12 not only has two stops A, B, but also extensions 13, 1
Joint part 1 in tilting spring 11 by 4
5, 16, both stops A, B have a defined position relative to the snap arm 17 and a defined spacing between them. Due to their integral design, the switching arm 18 and the snap arm 17 also have a defined position relative to one another.

In the case shown, the stop B is the lateral extension 1
5 and 16, and with this configuration, the configuration of the punching tool can be simplified. For this reason, the end 19 is offset by the bend 28 with respect to the plane of the remaining switching arm 18. However, an arrangement is also possible in which the switching arm 18 is in the same plane and the stops A, B are arranged above and below the extensions 15, 16, respectively.

During operation, the operating arm 2, on the one hand,
It occupies a balance position in relation to the force exerted via the actuating member 6 on the one hand and in relation to the elastic return force of the actuating arm 2 on the other hand. When the operating force is reduced and the operating arm 2 moves upward from the illustrated position of the snap system, the joints 9 and 1
As soon as 5,16 crosses the consideration point, the thin plate strip 2
2 rests on the adjusting device 27, a snap-type switching takes place. A predetermined minimum contact pressure is maintained until this switch occurs. A similar situation arises due to reversal of the operating device.

In the embodiments of FIGS. 4 and 5, FIGS.
Elements corresponding to those in the embodiment shown in the figures are numbered with 100 added. In this embodiment, a coil spring is used as the tilting spring 111. On the right side there is provided a support plate 130 with a window 112 in which a snap arm 117 and a switching arm 118 engage. On the left side, operation arm 1
Support plate 13 forming a bearing for 02
1 is provided.

When the snap switch according to the invention is used as a thermostat switch, in particular a thermostat switch for refrigerators, the operating mechanism is subjected to temperature-related loads. In this case, the switching temperature can be precisely adjusted by means of the regulating device 27. Due to the precise distance between stops A and B, relatively small temperature differences can be adjusted even in mass-produced snap switches.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of the snap switch according to the present invention, FIG. 2 is a side view schematically showing the snap switch built into the casing,
3 is a sectional view parallel to the window area of the tilting spring; FIG. 4 is a schematic diagram showing the tilting spring area of a snap switch according to another embodiment; and FIG. 5 is a support on the right side shown in FIG. It is a front view of a plate. 1...Casing, 2,102...Operation arm,
3, 8, 19, 23... end, 4... rivet, 5...
Longitudinal stay, 6... Operating member, 7, 26... Range, 9, 15, 16... Joint portion, 10... Slit, 11, 111... Tilt spring, 12, 112...
Window, 13, 14... Extension part, 17, 117... Snap arm, 18, 118... Switching arm, 20,
21... Contact, 22... Spring thin plate, 24... Spring section,
25... Punching part, 27... Adjusting device, 28... Bending part, 38... Web, 130, 131... Support plate, A, B... Stopper.

Claims (1)

[Scope of Claims] 1. A snap switch having a snap system disposed within a casing, the snap system having an operating arm operable from the outside and a snap arm, each of which has one end attached to the casing. is fixed to
and at the other end via each joint,
A switching arm, formed by a bent sheet metal strip and connected to a tilting spring arranged between the arms, holding a movable contact, is arranged adjacent to the snap arm; of the tilting spring 11, in which the switching arm is adapted to be carried during the movement of the snap arm by one of two stops acting on the switching arm from mutually opposite sides; In the end section on the side of the snap arm 17 a window 12 is arranged, into which the free end of the switching arm 18 protrudes, the window edges lying opposite each other are located at the stops A, B.
A snap switch characterized by forming a. 2. The window 12 has extensions 13, 14, which are lower in height than the height of the stops A, B on both sides, and extensions 13, 14 on both sides, next to the snap arm end 19. 2. The snap switch according to claim 1, wherein the arranged joint portions 15, 16 are engaged. 3. Claim 2, in which the joint parts 15, 16 are connected to each other at their free ends.
Snap switch mentioned in section. 4 the snap arm 17 is constructed in one piece with the switching arm 18 and has two partial arms extending along both sides of the switching arm;
A snap switch according to any one of claims 1 to 3. 5 Snap arm 17 and switching arm 18
is a part of the thin plate strip 22 made of spring steel,
5. A snap switch according to claim 4, wherein said sheet metal strip has a spring section 24 common to both arms. 6. A snap switch having a snap system disposed within a casing, the snap system having an operating arm operable from the outside and a snap arm, each arm being fixed to the casing at one end thereof,
and at the other end via each joint,
Switching arms holding movable contacts and coupled to a tilting spring arranged between the arms are arranged adjacent to the snap arm, the switching arms being arranged opposite to each other during movement of the snap arm. In the version adapted to be carried by one of the two stops acting on the switching arm from the side, the end of the coil spring 111 acting as a tending spring on the side of the snap arm 117 is A support plate 130 is provided which is pivotally connected to the snap arm and in which a window 112 is arranged, into which the free ends of the switching arms 118 extend and are located opposite each other. A snap switch characterized in that a window edge forms stoppers A and B.